The Repair and Enhancement of Large Diameter Caissons by Grouting

Bruce, Donald A.; Traylor, Robert

doi:10.1061/40511(288)5

Cited by 4 publications

(3 citation statements)

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“…According to the literature [3], post-grouting reinforcement technology was first used in 1958 by Venezuela in the construction of the Maracaibo bridge using grouting tube to reinforce the pile in the bridge foundations, and was tested and found to have significantly improved the pile-bearing capacity. Bu et al [4] conducted static load tests on bored pile and post-grouting bored pile in a trial piling project for the Sutong Yangtze River Bridge.…”

Section: Introductionmentioning

confidence: 99%

Study on Vertical Load-Carrying Capacity of Post-Grouting Bored Piles

Kong

Gan

2022

Applied Sciences

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The relationship between pile side frictional resistance and pile tip resistance and settlement is assumed to be ideal elastic–plastic. The load-transfer method is used to analyze the load-bearing characteristics of bored pile in actual projects, and the results are compared with static load test results to prove the reliability of the analysis method and its parameters, on the basis of which the bored piles are reinforced with grouting, namely, pile tip grouting, pile side grouting, and pile tip pile–side composite grouting, are analyzed. The results show that the pile tip grouting mainly improves pile tip resistance and has almost no effect on pile side frictional resistance; the pile side grouting improves pile tip resistance and pile side frictional resistance more significantly; and pile tip–pile side composite grouting improves pile tip resistance and pile side frictional resistance more significantly than the first two. The ultimate load-carrying capacity of the pile is increased by 19%, 49%, and 53% after the use of pile tip grouting, pile side grouting, and composite grouting respectively.

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Section: Introductionmentioning

confidence: 99%

Study on Vertical Load-Carrying Capacity of Post-Grouting Bored Piles

Kong

Gan

2022

Applied Sciences

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“…In the bored pile installation process, the drilling machinery will agitate, cut, and squeeze the soil under the pile base, which will largely affect the base soil resistance. Moreover, the residues remained at the pile base will also hamper the mobilization of the pile base bearing capacity [6,7]. During the bored pile installation process, the slurry with a certain density is remained in the pile hole to keep the pile hole stable.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Testing the Effect of Base Post-Grouting of Super-Long Piles

Jin

Yang

et al. 2022

Applied Sciences

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The base post-grouting technology is widely used in pile foundation engineering to improve its behavior. For super-long piles, due to the large compression of pile shaft, conventional static load tests cannot effectively test the effect of post-grouting at the pile base. This study introduced a novel method to test the effect of base post-grouting of three 88 m long piles. A total of three test piles were grouted at the bottom of the piles. The grouting amount of the No. 1 pile was 500 kg, the No. 2 pile was 250 kg, and the No. 3 pile was 0 kg. The transmitted wave method in the pile and dynamic penetration method were used in combination to quantitatively evaluate the effect of base post-grouting on the soil below the pile base. The influencing range of base post-grouting was firstly evaluated by the transmitted wave method in the pile, and the strength of the soil before and after grouting under the same pile base was measured by the dynamic penetration method. The test results showed that: the depth of the pile base reinforcement was 2 m for No. 1 pile, and 1 m for No. 2 pile, which was consistent with the grouting amount; the elastic modulus of the soil below the pile base after base post-grouting was about twice that of the soil before base post-grouting; the strength of the soil below pile base was largely improved after grouting; and the bearing capacity of the base soil layer increased from 35.5% to 41.7% when the grouting amount increased from 250 kg to 500 kg.

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“…This is compounded by the difficulty of inspection due to the large depth, limited accessibility and potential instability of shafts [ 2 ]. Moreover, the repair work of pile foundations is difficult and costly if large defects occur [ 3 , 4 , 5 ]. Therefore, testing techniques for the integrity of bored pile are highly valued.…”

Section: Introductionmentioning

confidence: 99%

Integrity Testing of Pile Cover Using Distributed Fibre Optic Sensing

Rui

Kechavarzi

O'Leary

et al. 2017

Sensors

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The integrity of cast-in-place foundation piles is a major concern in geotechnical engineering. In this study, distributed fibre optic sensing (DFOS) cables, embedded in a pile during concreting, are used to measure the changes in concrete curing temperature profile to infer concrete cover thickness through modelling of heat transfer processes within the concrete and adjacent ground. A field trial was conducted at a high-rise building construction site in London during the construction of a 51 m long test pile. DFOS cables were attached to the reinforcement cage of the pile at four different axial directions to obtain distributed temperature change data along the pile. The monitoring data shows a clear development of concrete hydration temperature with time and the pattern of the change varies due to small changes in concrete cover. A one-dimensional axisymmetric heat transfer finite element (FE) model is used to estimate the pile geometry with depth by back analysing the DFOS data. The results show that the estimated pile diameter varies with depth in the range between 1.40 and 1.56 m for this instrumented pile. This average pile diameter profile compares well to that obtained with the standard Thermal Integrity Profiling (TIP) method. A parametric study is conducted to examine the sensitivity of concrete and soil thermal properties on estimating the pile geometry.

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The Repair and Enhancement of Large Diameter Caissons by Grouting

Cited by 4 publications

References 0 publications

Study on Vertical Load-Carrying Capacity of Post-Grouting Bored Piles

Study on Vertical Load-Carrying Capacity of Post-Grouting Bored Piles

A Novel Method for Testing the Effect of Base Post-Grouting of Super-Long Piles

Integrity Testing of Pile Cover Using Distributed Fibre Optic Sensing

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